We should try to use split buttons for all toolbar color choosers, for a longer
rationale, see: bug 45671.
How to get to see the button:
* open Impress or Draw
* click into ine of the text boxes
/Result/ A blinking caret appears in the text box, the Text Formatting toolbar opens.
* in the Text Formatting toolbar, look for the Font Color button (icon: an "a" atop a fat colored line)
See that this button is a simple button, not a split button.
Thanks for bugreport
reproduced in 3.6.0rc in Impress and Draw for "Font color" button
in Writer and Calc all buttons are already splitted
Fixed with http://cgit.freedesktop.org/libreoffice/core/commit/?id=584b415924bba22db23a4258062e54973de0ed7c